| Developer(s) | HP Labs (until October 2009) |
|---|---|
| Stable release | 2.6.4 / December 12, 2010 |
| Operating system | Cross-platform |
| Type | Semantic Web |
| License | BSD-style license |
| Website | http://openjena.org/ |
Jena is an open source Semantic Web framework for Java. It provides an API to extract data from and write to RDF graphs. The graphs are represented as an abstract "model". A model can be sourced with data from files, databases, URLs or a combination of these. A Model can also be queried through SPARQL and updated through SPARUL.
Jena is similar to Sesame; though, unlike Sesame, Jena provides support for OWL (Web Ontology Language). The framework has various internal reasoners and the Pellet reasoner (an open source Java OWL-DL reasoner) can be set up to work in Jena.
Jena supports serialisation of RDF graphs to:
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Joseki is an RDF server. The goal of Joseki is to provide an HTTP interface to RDF data. It fully supports SPARQL for querying and updating. The project is a sub-project of Jena and is developed as a Java EE application. Joseki can also be run stand-alone server as it ships preconfigured with the Jetty web server.